ZSU

Today my cars engine stopped when I slow down.. it has automatic transmission.. Sometimes when I start engine the idle goes down (battery gauge goes down too) and engine stops..
Any ideas???

needadvice

could be a dying alternator. Does it start up strong?

Make sure there's no corrosion all over the battery terminals.

ZSU

usually it happens at start up(first start of the day) idle goes down battery gauge goes down and car stops.
But today engine stops when I slow down my car.. after that happened I crank the engine and it starts.
You say it can be becuz of Battery or alternator, not about engine parts or fuel pump etc?

needadvice

I don't know what it is yet, could be alot of things, but when a voltage guage drops I first think of electrical stuff.

On the other hand, when a fuel filter is dirty the engine will first begin stalling when at idle and when coming to a stop. Thats when the fuel pressure is at its lowest and if there is a clog building up in the filter, thats when the clog will win the battle and the engine will stall. Under acceleration or while crusining the pressure is much higher and can defeat the clog until it gets really bad. Also, clogged fuel injectors.

When was the filter changed last?

needadvice

also, if the car is dying its normal for the voltage and the oil pressure to slowly drop off as the engine is dropping off.

ZSU

I really donot remember when, may be 2-3 year its same.. I used Wynns injector cleaner add it before adding fuel.. it happened 1 time again after I do that.

And you mean dying? my cars engine is dying? I hope not..
cuz it limited slip has been changed, transmission rebuilt.. and engine is dying it cost me much hope not happen soon..
I hope its only clog and filter..
By the way thank you for your interest!!

ZSU

And whats the normal oil pressure gauge values?? at idle and higher rpms for trans am lt1?

needadvice

No, I don't mean there is anything wrong with the engine. But if the fuel filter is clogged the engine will die at idle and when you take your foot of the gas pedal and come to a stop, its a clear symptom of a clogged fuel filter.

MAF could be dirty too?

Change the fuel filter, its a very cheap and fast job to do. It will rule out the filter anyway.

needadvice

at cruise speeds maybe 40 psi when warmed up to normal temp.

ZSU

I think I got problem!

My cars at idle or at D(while stopping) it show between redline and 20psi..
Why that can be happen??

Car donot go tight.. I am not sure what is happenin.. :/

aboatguy

Nope, not your problem 15-20 psi is normal for a hot LT1 at idle.....